10 weeks old, decrease in feedings?! HELP! FTM

My boy is 10 weeks old and has stopped feeding as frequently and eats for less time when he is latched on. I'll noticed that it's been 2 hours since he last ate and will try to latch him on even if he's not showing hunger signs but he will just cry and won't latch. If I wait for him to show hunger signs he latches and feeds no problem, but just isn't feeding as long. He is still having 8-10 wet diapers a day and 3 or more poops a day.

Also his fists 👊 are ALWAYS at his mouth. I was reading it as a hunger sign but now I’m wondering if it’s normal for a 10 week old to always be sucking on their fists?